Prismatic sighting-telescope.



No. 708,720. Patented Sept. 9, |902.

t A. KNIG. PRI'SMATIC SIGHTING TELESCOPE.

(Application med Nov. 14, 1901.) Y (No Model.) 2 Sheets-Sheet I.

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PRISMATIC SIGHTING TELESCOPE.

Patented Sept. 9, [902.

(Application filed Nov. 14,' 1901.)

@Sheets-Sheet 2.

(No Model.)

NiTED STATES- ALBERT KNIG, or JENA,

GERMANY,

ASSIGNOR TO FIRM OF CARL ZEISS,

OF JENA, GERMANY.

PRI-SIVIATIC SIG HTlNG-TELESCOPE.

SPECIFICATION forming part of Letters Patent No.1'708,720, dated* September`- 9, 1902.

i n Application filed.November 14, 1901. Serial No. 82,328. (No model.)

To a/ZZ whom, t may concern:

Be it known that I, ALBERT KNIG, doctor of philosophy, a subject 'of the King of Prussia, residing at Carl Zeiss Strasse, Jena, in the Grand Duchy of SaXe-WeimarGerman Empire, have invented a new and useful Prismatic Sighting-Telescope, of which the. following is al specification.

The invention relates to sights for rifles and other small guns; and it consists of a prismatic sighting-telescope (a prismatic telescope .having Va reticle or similar device in .the focus of the object-glass) in which the eyepiece is inclined lo the object-glass at such an angle that their aX'es bisect or cross each other in front of the object-glass. A prismatic telescope of this description when suitably-t. e., object-glass above and eyepiece below-fitted on a rifle compels the marksman to direct his glance upward corresponding to the inclination of the eyepiece instead oi' looking, as with the parallel-vision prismatic'sighting-telescope, ahead in the direction toward the object; but this comparatively insigniticant drawback of the amended rifle-sighting telescope is more than counterbalanced by its specific advantage, which is the object ot'the present invention and consists in aconsiderable reduction in the size Aof the prismcasin'g, and by consequence in the weight and cost of the instrument in comparison to the parallel-vision prismatic sighting-telescope having the same effect- 71. e., the same elevation of the axis of the object-glass above the aiming-eye. This elevation constitutes already the superiority of the parallel-vision prismatic sighting-telescope over the common direct-vision-lens sighting-telescope, because it raises the cone of the field of view clearof the obstructing fore end of the firearm.

In the accompanying drawings, Figure lis a side View of the improved sighting-telescope attached to an ordinary hunting-gun. Fig. 2 is aback view of the same. Fig. 3 is a side View of the telescope attachedto a Mauser repeating-rifle. Fig. 4 is a back view of the Fig. 5 is a side view of a prism combination adapted to realize the invention. Fig. G is a back View of the same.

In the example shown in Figs. l and 2 the prism-casing a, having the inclined eyepiece shownin ci at the back and the object-glass a2 in front, is attached to a tube b, joined to the breech of the gun by meansof the feet bo. The eye` center c is situated in the usual line ol sight determined by back sight CZ and fore sight e.

The object-glass a2 lies at such a level that would establish the arrangement of the parallel-vision prismatic sighting-telescope, but at the same time necessitates a considerable downward prolongation of the prism-casing ct. The breech-closing leverf would also be less accessible if the prism-casing a reached much farther down.

In the example of Figs. 3 and 4 the eye-cen ter c lies also in the direction of the line of sight d e. Again, assuming the eyepiece-axis being rotated about cinto a position parallel to the object-glass axis and coinciding with the line c d e there would be no. possibility of proportionally extending downward the prism-casing a, as the requisite space is already occupied by the bolt gf), Fig. 4, of they breech -action g when fully drawn back, as Hence when a rifle of this or like construction is used the position of the aiming-eye could not be so low-rl. e., the head could not be heldin such a comfortable position with a parallelvision prismatic sighting-telescope as with the improved one.

Theinvention can be realized with every type of prism combination for rerecting the image; but the ordinary parallel-Vision arrangement of such prism system must be adapted to the inclination of the eyepiece-axis IOS 5 and G is Well known in its ordinary parallel-vision arrangement, from which it only differs by the shape of the prism g. This prism being a so-callcd Amici prism reerects the image. The rays A after having passed the surface ofentrance g' are twice reiiected-one half by the surfaces g2 and g3 successively and the other halt` by the surfaces g3 and gzsuccessively. The final deflection of the axial ray produced by this prism is less than the ordinary value of ninety degrees, because the inclination of the couple of reflecting-surfaces g2 and g3 to the surface of entrance g and the inclination of the surface of emergence g4 to this surface g have beensuitablyaltered. Thepentagonalprism 72 Well known as Prandls prism, having the surface of entrance 7L', the two silvered reiecting-surfaces h2 and h3, and the surface of emergence 7a4, is not altered, the final deflection of the axial ray produced by this ALBERT KNIG.

Witnesses:

EMIL DONITZ, PAUL KRGER. 

